upm

-feat: new feature                                       (minor increase ex: 1.0.0 to 1.1.0)

-fix: bug fix                                            (patch increase ex: 1.0.0 to 1.0.1)

-add: add new file, script ...

-remove: remove file, remove method

-update: update name method, name file, name ....

-docs: documentation only changes                        (version no change)

-style: changes that do not affect the meaning of the code 
(white-space, formatting, missing semi-colons, etc)     (version no change)

-refactor: code change that neither fixes a bug nor adds a feature       (version no change)

-perf: code change that improves performance             (patch increase ex: 1.0.0 to 1.0.1)

-test: adding missing or correcting existing tests       (version no change)

-chore: changes to the build process or auxiliary tools 
and libraries such as documentation generation           (version no change)

source: https://medium.com/openupm/how-to-maintain-upm-package-part-2-f352fbf5f87c
        https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines